A TSG investigation unmasks the leader of Pranknet and the miscreants behind a year-long wave of phone call criminality AUGUST 4--At 4:15 AM on a recent Tuesday, on a quiet, darkened street in Windsor, Ontario, a man was wrapping up another long day tormenting and terrorizing strangers on the telephone. Working from a sparsely furnished two-bedroom apartment in a ramshackle building a block from the Detroit River, the man, nicknamed "Dex", heads a network of so-called pranksters who have spent more than a year engaged in an orgy of criminal activity--vandalism, threats, harassment, impersonation, hacking, and other assorted felonies and...